On parallel tracks, a 150 m train at 45 km/h and a 210 m train at 63 km/h approach each other. How many seconds do they take to pass each other completely?

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Accepted Answer

12. Relative speed = 45 + 63 = 108 km/h = 30 m/s. Total length = 150 + 210 = 360 m. Time = 360 ÷ 30 = 12 seconds.

On parallel tracks, a 150 m train at 45 km/h and a 210 m train at 63 km/h approach each other. How many seconds do they take to pass each other completely?

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